Copy and Paste Table of Contents (TOC)

Save the page , and when not in page edit mode Copy and Paste [Bottom up is sometimes easier to make the selection of the TOC text] the table of contents text to get the all named anchor links as pure HTML links. i.e. .../#TOC-SliderTitle

You can modify the names and remove numbers even delete headings you
don't require for you slider. Remove the formating by selecting the
entire pasted TOC using Tx menu button OR CTRL + \ [Control and Backslash] to remove borders and other formatting.

Important : Set the surrounding content div to a fixed height and
hide overflow [viewing size i.e size of image, video or article etc...]
Edit by using up and down arrows or remove the height to make general
edits.

Tidy up Content for the slider.

Create Separate Columns

Finally place the links in a separate column or even sidebar to the
content you want to slide up and down. You can then place the Slider
content where ever you want on the content page, once they have a
Heading format [i.e. Format > Heading 3].

You should keep
the main Title just to have a page reference to return to.Yo can also
have it fixed above the slider content always visible like in the manual
example below.

Manually Create the HTML Slider Gallery

Copy and paste the following HTML below into your Google Sites HTML
page (Use the <HTML> button) . You can also try it in the LIVE
HTML editor.

The Last empty div <div style="height:550px;"></div>is important so that the page has enough space to move up and not move down to the content!Check the number of </div> to closing </div> to make sure content is in between the main